diff --git a/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-1.yaml b/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-1.yaml
index 735c48708abe646996c0014d340ea069adb61819..9086e1bde10cf629489a15b86dcf0391a3da161f 100644
--- a/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-1.yaml
+++ b/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-1.yaml
@@ -8,7 +8,7 @@ yeti-1:
     nb_threads: 128
     platform_type: x86_64
   bios:
-    release_date: 09/12/2024
+    release_date: '09/12/2024'
     vendor: Dell Inc.
     version: 2.22.2
   bmc_version: 7.00.00.173
diff --git a/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-2.yaml b/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-2.yaml
index bcae7609faf3b00f22b71886b17b3e7b7b1a8d64..b016c895594f55e05d9aa08f4ca12ab89018cde8 100644
--- a/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-2.yaml
+++ b/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-2.yaml
@@ -8,7 +8,7 @@ yeti-2:
     nb_threads: 128
     platform_type: x86_64
   bios:
-    release_date: 09/12/2024
+    release_date: '09/12/2024'
     vendor: Dell Inc.
     version: 2.22.2
   bmc_version: 7.00.00.173
diff --git a/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-3.yaml b/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-3.yaml
index 19d1576dd401d0332c252c7eff4924930f5836e8..e09aad12327d8e2e95801789aca9907bb78b4d0c 100644
--- a/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-3.yaml
+++ b/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-3.yaml
@@ -8,7 +8,7 @@ yeti-3:
     nb_threads: 128
     platform_type: x86_64
   bios:
-    release_date: 09/12/2024
+    release_date: '09/12/2024'
     vendor: Dell Inc.
     version: 2.22.2
   bmc_version: 7.00.00.173
diff --git a/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-4.yaml b/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-4.yaml
index 40e45f99c12cc189cae3c901f02ce73d7bbccb28..1caefc90e6b358a544f80153a0040323cf98d4c9 100644
--- a/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-4.yaml
+++ b/input/grid5000/sites/grenoble/clusters/yeti/nodes/yeti-4.yaml
@@ -8,7 +8,7 @@ yeti-4:
     nb_threads: 128
     platform_type: x86_64
   bios:
-    release_date: 09/12/2024
+    release_date: '09/12/2024'
     vendor: Dell Inc.
     version: 2.22.2
   bmc_version: 7.00.00.173